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    "### 一、系统（特征）函数\n",
    "\n",
    "#### 1. LTI 系统的特征函数\n",
    "\n",
    "![](LTI-system-function.png)\n",
    "\n",
    "推导发现 LTI 系统的特征函数 $H(s)$ 就是该系统冲激响应的 LT"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 2.1 通过系统的微分方程/差分方程求解系统函数"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![](get-system-func-by-equations.png)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 2.2. 通过系统的单位冲激响应求取系统函数\n",
    "\n",
    "![](get-system-func-by-impulse-resp.png)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 3. 系统函数与系统框图"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "待续"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 4. 系统函数的应用\n",
    "\n",
    "1. 求系统的冲激响应、零状态响应\n",
    "2. 分析系统的稳定性、因果性\n",
    "3. 分析系统的频响特性、相位特性\n",
    "4. 进行滤波器设计"
   ]
  },
  {
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   "outputs": [],
   "source": []
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